Heisman Trophy. No. 1 overall pick in the NFL draft (though going to a winless Cleveland Browns team may temper some of the excitement).

But it wasn't always smooth sailing for the star quarterback. In a Fox Sports docu-series, "All the Way Up," Mayfield discusses the rocky start to his college career, when he was a walk-on freshman at Texas Tech.

He went 5-0 as a starter before suffering a knee injury -- and that's when Mayfield says things took an abrupt turn in his relationship with Red Raiders coach Kliff Kingsbury.

"It went from being 'the guy' for Coach Kingsbury," Mayfield recalls in a clip posted by TMZ, "and then when I got hurt, it just changed a little bit ... not a little bit, a lot.

"All the sudden it was as if I hadn't played for him, hadn't done anything for him. It was just different after I got hurt."

Reached for comment, Kingsbury didn't deny anything Mayfield said.

"I’ve always been a huge fan of Baker and loved working with him. He had an incredible career at Oklahoma, and I wish him nothing but continued success as he begins his NFL career," he told TMZ.

Texas Tech didn't offer Mayfield a scholarship for his sophomore season, so he transferred to Oklahoma -- where he went on to bigger and better things.

31. Colts (32): Really nice to see Andrew Luck practicing and, apparently, pain-free. Also great he's scorching defense in practice ... but he's only first who will do that this year. Brian Spurlock, USA TODAY Sports